Service Manual — page 179 of 715

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FUEL SYSTEM (DFI) 3-89
ECU Communication Error (Service Code 39)
ECU Communication Line Inspection
○When the data is not sent from the ECU to the meter unit
 for more than about 10 seconds, the service code 39 is
 displayed.
○The service code 39 is detected with meter unit.
•Remove the ECU and meter unit, check the wiring for
 continuity between main harness connectors.
○Disconnect the ECU and meter unit connectors.
    Wiring Continuity Inspection
     ECU Harness Connector [A] ←→ Meter Unit Connector
     [B]
        BL/O lead (ECU terminal 26) [C]
    If the wiring is good, check the meter unit (see Meter Unit
    Inspection in the Electrical System chapter).
    If the meter unit is good, replace the ECU (see ECU Re-
    moval/Installation).
ECU Communication Line Circuit

     1. ECU
     2. Frame Ground 6
     3. Meter Unit
     4. Yellow Engine Warning Indicator Light (LED)